---
title: "How to compare two texts and find the differences"
description: "Compare two versions of a text or file, see every added and removed line, and choose between line and word comparison for the cleanest result."
canonical: https://toolsugar.com/blog/how-to-compare-two-text-files
image: https://toolsugar.com/og.png
---

# How to compare two texts and spot what changed

Updated 2026-11-09

To compare two texts, paste the old version in one box and the new one in the other, then read what was added and removed. Diff Checker does this in your browser, line by line or word by word, and your text is never uploaded. It counts the changes and marks them with symbols, so you can read the result without relying on color.

[Open Diff Checker](https://toolsugar.com/tools/diff-checker)

## Compare two texts in four steps

Keep the older version on the left side of your mind. Everything the tool marks as removed comes from the first box.

1. Paste the old version into Original and the new version into Changed.
2. Choose Line by line or Word by word.
3. Read the summary of added and removed items.
4. Scan the result. Lines start with + or -, and words are underlined or struck through.

## Line mode or word mode

Line mode treats each line as one unit. It suits code, config files and lists, where a changed line is the thing you want to see. If one word moves inside a long line, the whole line shows as removed and added.

Word mode compares word chunks inside the text. Use it for prose, where one edited sentence in a long paragraph would otherwise light up the entire paragraph.

## Read the counts

The summary gives the total added and removed lines, or word chunks in word mode. A changed line counts as one removal and one addition. That is how every diff reads, so a count of one added and one removed usually means one edit.

If the counts look huge, check for invisible differences before you read every line. A diff is also a fast review aid. Before you deploy a config, paste the live version and the new one, then confirm that only the lines you meant to touch appear. Anything else, such as a changed port or a deleted key, shows up at once.

## Why identical-looking lines show as different

Trailing spaces and tabs against spaces look the same on screen but are different characters, and line mode flags them. Word mode ignores changes in spacing. A pasted file that was reformatted will show a change on nearly every line.

Run both versions through the same formatter first, then compare them again. Case counts too. The tool treats Name and name as different, so a rename that only changes capitals shows as a full removal and addition. For prose with many small edits, switch to word mode and read the underlined and struck words in order.

## Questions

### Can I compare two code files?

Yes. Paste the contents of each file into the two boxes and use line mode. The + and - marks work the same way as in a pull request.

### Is there a size limit for the text?

The tool does not state one. Very long texts take longer to process in the browser, so compare sections if the page slows down.

### Does the order of the boxes matter?

Yes. Original is the baseline. Swapping the boxes flips every addition into a removal.

[Open Diff Checker](https://toolsugar.com/tools/diff-checker)

## Related guides

- [How to format JSON online](https://toolsugar.com/blog/how-to-format-json)
- [How to URL encode and decode a string](https://toolsugar.com/blog/how-to-url-encode-a-string)
- [How to count tokens in a prompt before sending it](https://toolsugar.com/blog/how-to-count-tokens-for-ai-models)
- [How to format SQL queries](https://toolsugar.com/blog/how-to-format-sql)